arm: Move unrolled array initialization to Assembler.

runtime/vm/assembler_arm.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 654 matching lines @@
                                 const Address& dest,
                                 const Object& value);
   void StoreIntoObjectNoBarrierOffset(Register object,
                                       int32_t offset,
                                       const Object& value);
 
   // Store value_even, value_odd, value_even, ... into the words in the address
   // range [begin, end), assumed to be uninitialized fields in object (tagged).
   // The stores must not need a generational store barrier (e.g., smi/null),
   // and (value_even, value_odd) must be a valid register pair.
+  // Destroys register 'begin'.
   void InitializeFieldsNoBarrier(Register object,
                                  Register begin,
                                  Register end,
                                  Register value_even,
                                  Register value_odd);
+  // Like above, for the range [begin, begin+count*kWordSize), unrolled.
+  void InitializeFieldsNoBarrierUnrolled(Register object,
+                                         Register begin,
+                                         intptr_t count,
+                                         Register value_even,
+                                         Register value_odd);
 
   void LoadClassId(Register result, Register object, Condition cond = AL);
   void LoadClassById(Register result, Register class_id);
   void LoadClass(Register result, Register object, Register scratch);
   void CompareClassId(Register object, intptr_t class_id, Register scratch);
   void LoadTaggedClassIdMayBeSmi(Register result, Register object);
 
   void LoadWordFromPoolOffset(Register rd, int32_t offset, Condition cond = AL);
   void LoadFromOffset(OperandSize type,
                       Register reg,
@@ skipping 344 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_